An ionic bond is defined as the chemical bond of electrostatic attraction between negative and positive

ions

Explanation:

An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element .The element which accepts the electrons is known as electronegative element.

When an atom looses its electron, it results in the formation of a positive ion which is known as cation and when an atom gains electron, it results in the formation of a negative ion known as anion. These oppositely charged ions are held by coloumbic forces of attraction.